Register fan



Jan. I4, 1930. J. L. WATERBURY REGISTER FAN Filed MaJ-'ch 30. '1927 5 Sheets-Sheet Jan. 14, l 930. J. L. WATERBURY v REGISTER FAN Filed March 50. 1927 5 sheets-sheet mmmmmmmm 1]. WLru/fy l@ im. y i.

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Jan. 14, 1930. J, L. WATERBURY 1,743,994

REGISTER EAN Filed Marchio. 1927 5 Sheets-Sheet v 3 Jan. 14, 1930. 1 WATERBURY 1,743,994

REGISTER FAN Filell March 30. 1927 5 Sheets-Sheet 4 Jan. 14, 1930.

J. L. WATERBURY REGI STER FAN Filed March 50; 1927 5 Sheets-Sheet 5 #mman Patented Jan. 14, 1930 UNITED STATES PATIENTvv OFFICE JAMES L. WATERB'URY, OF ST. PETERSBURG, FLORIDA, ASSIGNOR TO WATERBURY ERWIN CORPORATION, 0F SPRINGFIELD, OHIO, A CORPORATION OF OHIO REGISTER FAN Application iled March 30, 1927. Serial No. 179,704.

The present invention relates to improvements in register fans and more particularly relates to a fan installation in combination with a register whereby hot air may be positively circulated through the room and in which a local circulation of air in the room may be effected.

An object of the invention is to provide for active circulation of hot air in the hot air stack which conveys this hot air from the furnace, heater or other source to the various rooms and apartments distributed throughout the building. It is Well-known that in certain apartments and rooms a counter-pressure exists which the pressure of the air within the stack is not equal to and for this reason the air will not enter such room or apartment. Moreover, in the up er apartments or rooms the draft is not alivays strong enough to draw the hot air into the rooms and apartments.

It is therefore another object of the present invention to provide for an enforced draft in the hot air stack and an enforced drawing of the hot air from the stack and into the room or apartment in'which the device is situated.

A further object of the invention is to provide for the regulation of this draft or enforced entrance of the hot air into the room or apartment.

A still further object of the invention resides in providing a device for accomplishing the above purposes, which is confined to small space, is economical in its construction and installation and is so situated that ready access may be had thereto for the purpose of original installation and subsequent repair and removal of parts.

With the foregoing and other objects 1n view, which will readily become apparent to those skilled in this art, the invention will be described more in detail hereinafter and pointed out in the subjoined claims.

In the drawings, in which like parts are de- Figure 6 is also a vertical section showing a further modified form of the invention;

Figure 7 is a vertical fragmentary section similar to Figure 1, with the improved device illustrated in elevation and with th grille removed;

Figure 8 is a vertical section taken on the line 8 8 in Figure 6;

Figure 9 is also a vertical section taken on the line 9 9 in Figure 7;

Figure 10 is a view similar ,to Figure 9, but showing a slight modification;

Figure 1l is a vert-ical transverse section through parts of a building, hot air stack and register box, showing a further modified form of the invention;

Figure 12 is a front View thereof, with parts broken away;

Figure 13 is a front elevation with parts broken away of a further modified form of register fan with portions of the building in section and broken away; i

Figure 14 is a vertical section taken cen-A trally through the device on the line 14 14 in Figure 13;

Figure 15l is a horizontal section on the line 15-15 in Figure 14;

Figure 16 is a View similar to Figure 3, but with parts broken away and showing a slight modification over the embodiment shown in Figure 3;

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Figure 17 is a front elevation of a modified form of grille;

Figure 18 is a rear elevation of the same;

Figure 19 is a longitudinal section taken through the grille on the line 19-19 in Figure 17;

Figure 20 is a view similar to Figure 19, but showing a slight modification thereover;

Figure 21' is a transverse section taken on the line 21-21 in Figure 20;

Figure 22 is a rear elevation with parts broken away of a further modified form of the grille and fan assembly;

Figure 23 is a vertical central section taken on the line 23-23 ir Figure 22;

Figure 24 is a longitudinal section taken on the line 24-24 in Figure 22;

Figure 25 is a front elevation with parts broken away, and in section of a further modified form of device;

Figure 26 is a longitudinal central section taken on the line 26-26 in Figure 25;

Figure 27 is a cross section with parts shown in elevation of a further modified form of grille and fan assembly; and

Figure 28 is a fragmentary central section through an improved form of fan mounting.

Referring in the first instance to that form of the invention shown in Figures 1 to 4 inclusive, 30 in Figure 3 designates a furnace or heater illustrated conventionally, and 31 represents a hot air stack built into the building, the floors of which are indicated at 3 2 and the walls at 33. A register box 1s indicated at 34, having as shown in Figure 2, a through passage for the hot air and connecting at its lower and upper ends with sections of the hot air stack 31. In Figure 2 the lower section of the stack is shown as formed with an inwardly offset, shouldered neck 35, about which the base of the register box 34 is adapted to fit and rest upon the shouldered portion thereof. At its upper end the register box may, if desired, be provided with asimilar inwardly offset and shouldered neck 36 to receive and support the lower end of the upper adjacent section-ef the hot air stack 31. It is quite immaterial, however, to the present invention ust how the connection of register box and stack is made.

The register box is, in accordance with the usual practice, made with one or more outl lets or openings to a room or rooms and in the present instance I have deemed it sufficient to illustrate the invention in connection with a single device for use in connection with one room only. C

This improved device consists generally of a combination of grille 37, movable damper 38 and motor fan 39. These three elements may be variously rmounted in the register box. consideration and illustrated in Figures 1 to 4 inclusive, the grille 37 forms the base of support for the fan, its motor and a pivoted In that form of the invention underdamper 38. The pivot point for the damper 38 is indicated at 40 and is shown in Figure 2 as being placed at the upper portion of the damper, whereby the damper, as it swings back angularly, may intercept a constantly greater mass of the hot air ascending up through the stack 31 and divert this mass of air through t-he perforated grille plate 37 into the room. In addition, this action of the draft and 'damper plate will be assisted by the electric or other fan 39.

The electric motor for the fan 39 is indicated at 41 and its armature shaft at 42, upon which the fan blades or vanes 39 are carried just behind the grille plate 37. The motor is provided with openings 43, through which a circulation of air may take place for the purpose of cooling the fan.

In the present instance, I have shown the fan motor as embraced in a pair of complemental semi-circular supporting members 44 and 45. These members are intermediate the ends of supporting arms. The upper arm is composed of mutual half-arm pieces 46 and 47, also preferably semi-circular in cross section to provide a hollow arm for the electric wires 48, which extend to the switch box 49,

shown in Figure 2 as carried by the upperv central portion of the grille plate 37 and as having the switch button or operating piece 50 exposed on the exterior for convenient opening and closing of the motor circuit.

In a similar manner a lower hollow supporting arm is provided by the similar mating sections 51 and 52 through which the leads 53 are brought to the motor from a plug connection 54, which is let in through the lower portion of the grille 37 and has connection with the lower portion of the lower supporting arm. The upper and lower arms are shown as substantially vertically disposed in Figures 1 and 3 and they may be affixed in any appropriate manner to the upper and lower central portions of the grille plate 37. In Figure 1, blank areas 55 and 56 are shown on the register plate, where the arms Contact and connect with the same in order to reinforce the grille at these points and to provide for proper attachment with the arms.

The semi-circular supporting members 44 and 45 for the motor are provided with the meeting flanges 57 and 58 through which the bolts or other fastenings 59 and 60 pass for securing the supporting members and arms together and about the motor. As shown more particularly in Figures 2 and 4, the damper 38 is of a generally flat form, being, however, provided with a central Socket 61 for receiving the motor and its support. The fan blades 39 project in front of the socket 4and between the gri-lle and damper plate. It

will be noted that as viewed horizontally in Figure 4, the sides of the socket 61 closely fit about .the supporting members for the motor, whereas viewed in the vertical aspect, as preures 2 and 4.

sented by Figure 2, the upper and lower portions of the socket 61 are enlarged and taper outwardly toward the upper and lower portions of the damper plate in order not only to afford ample room for the section-of the supporting arms, but to further provide for the entrance of the ascending hot air caughtin the lower free portion of the damper plate to a point back of the same, where it can be properly caught and circulated outwardly and into the room. This formation of the damper plate also affords ample opportunity for the cold air around the door zone in the room to be drawn by the fan through the lower portion of the grille plate and under the influence of the fan 39 by which it is again admixed with the heated air and, again circulated outwardly to the room, where it ascends because of the recently acquired heat from its contact with the hot air constantly introduced through the stack to the area in and about the register fan.

The motor 41 is preferably held in the supporting device by means of an interposed cushioning or resilient member or members 62. This part 62 might be a continuous ring or it might be composed of separated segmental blocks of rubber or other material, between which air might be circulated.

The supporting device comprising the semi-circular supporting members and the hollow arms provides at the rear central portion thereof a chamber 63 which receives air through the lower hollow arms 51, 52, the interior space of this lower arm being in communication with the external room atmosphere through the port 64 in the lower blank area 56 of the grille 37. This port 64 is positioned to receive cold air near the floor level which is drawn in through the action of the fan 39 to the chamber 63, circulated to and through the motor and through the openings 43 therein and thence being pulled out by the action of the rotating fan vanes 39. The outer edges of the semi-circular supporting mem-` bers 44 and 45 are flared, as indicated in Fig- The fully open position of the damper is shown in dotted lines in Figure 2 and it may be shifted to this or to any angular intermediate position between the full and dotted positions by any appropriate means, for instance by means of the notched adjusting bars v66, which are pivoted to the damper as indicated at 67 and extend through openings in the grille plate 37, the lower notched end being engaged with bars of the grille plate.

The grllle plate is held in place as, for instance, by the screws or other appropriate fastenings 68, four of which are indicated in Figure 1, although it will be understood that any appropriate number may be used. These screws pass through the edge or border 69 of the grille plate and take into the vertical indented'flanges 7 0 and 71 of the border member 72, which is substantially rectangular in construction, where the grille plate 37 is of the rectangular form shown. The side edges of the grille plate fit against the shoulders 73 and 74, which lie immediately adjacent the flanges 7 0 and 71 of the border member 72.

As shown in Figure 2, the top edge 75 of the grille plate 37 is turned backwardly at substantially right angles to the plane of the grille plate and it fits against the downwardly turned flange 76 on the inner end of `the upper inturned bar 77 of the border member.

At its lower end the grille plate is likewise provided with an angularly inturned lower edge 78 fitting against the upstanding flange 79 on the lower inturned bar 80 of the border member. At itslower edge the border member may rest directly upon the floor 32; the lower bar 80 rests upon the forward edge of the base of the register box 34, while the upper inturned bar 77 lits within the upper open mouth of the register box 34. The outer side edges of the border member are shown at 81 and 82, in Figure 4 as being carried backwardly to the wall 33, and in like manner the upper outer edge of the border member is shown at 83 as being carried also back to the wall 33. The air will be drawn in by the suction action of the fan through both the lower and upper portions of the grille plate particularly at the upper and lower bulged portions 84 and 85, and in a similar manner at the sides of the plate, which are also preferably bulged. The air thus drawn in from all about the fan will be sucked in centrally and forced outwardly through the central portion of the grille plate and into the room.

In the' operation of the device shown. in, Figures 1 to 4 inclusive, the closed position is as indicated in Figure 2. Here the heated air coming from the furnace, heater or other source below and ascending through the stack 31, will be excluded completely from the room or compartment by virtue of the fully closed position of the damper 38. The hot air will thus pass on to another room or apartment.

Figure 2 in dotted lines also shows the fully open position of the damper 38. In this position a maximum mass or volume of the ascending hot air will enter the room in which the device illustrated is installed. In addition to the amount of air which enters by virtue of the draft, the fan will create an enforced and positive draft in addition to the natural one, which will not only promote a more active circulation of the hot air in the stack, but will also forcibly draw in this hot air in great quantities into the room and there circulate that great mass of hot air, mixing it in a minimum of time with the cold indoor atmosphere and promoting a homogeneous Warm air throughoutthe entire upper and lower zones of the room. Any intermediate position between the fully closed and dotted line open position of the damper shown in Figure 2 may be selected in order to arrive at that fine adjustment of the room temperature desired. The adjustment will be a simple one throu h merely lifting the slotted bars 66 and shifting the damper about its pivot 40, whereupon the slotted bars 66 are again dropped to engage the bars of the grille plate, which will hold the damper in its newly adjusted position. In the fully closed position, shown in full lines in Figure 2, the motor is wholly protected from the hot air in the stack and in the open position of the damper, the motor is protected in a measure by the elements which support it. Of course,

the hot air has no access to the interior cooled chamber 63, which is supplied with air through the lower hollow arm and in this manner, although the hot air is circulating about and through the fan 39 during the open position' of the damper 38, nevertheless, a cool current of air from near the Hoor level is supplied to and circulated through the motor in order to prevent same from at any time running hot. Should the brushes or any other portion of the electric fan motor require repair or replacement, it becomes a' simple matter to remove the fastenings 68 and dismount the grille plate with the fan damper as a unit. This unit or assembly is relatively compact and may be carried to the electric-repairman and the repairs may thus be effected much more economically than where the electric-repairman would be required to go to the job. This easy removal also facilitates gaining access to the interior of the register box 34 and to the hot air stack. As shown in Figure 4, the forward side edges of the sidewalls 86 of the register box fit against the internal portions of the shoulders 73 and 74 and constitute a backing opposite to the side edges of the grille plate 37. The register box thus re-enforces the border member.

Referring now to Figure 5 similar parts have been given the same reference numerals and the construction and method of operation is precisely similar to that described in connection with the form of the invention shown in Figures 1 to\ 4, inclusive, except that the fan 39 is situated between the electric motor 41 and the damper 38 instead of between the motor and the grille, as in Figure 2. In order to accomplish this construction, the armature shaft 42a of the motor is projected to the rear of the motor. The supporting arms are shaped to seat the motor closer to the grille in order to afford room for the fan 39a in the base of the socket 61. The switch box 49 in this instance, is in the upper curved or bulged portion of the grille and the switch arm or button 50a is exposed upwardly instead of outwardly.

Referring now to Figures 6, 7, 8 and 9, a different form of border member or `frame is shown. Considering Figure 8, the top'portion of the border plate consists of the upper and lower spaced parallel walls 87 and 88. In like manner, the lower part of the border frame consists of the upper and lower spaced parallel walls 89 and 90, the spacing being reater to form a large air chamber 91. The ower wall 90 may be held elevated by the small feet 92 and 93.

One side portion of the border frame consists of the inner and outer spaced parallel walls 94 and 95. Between these walls are disposed four webs 96, 97, 98 and 99, and in each of the spaced transverse webs is one or more perforations 100, setting up communication between the compartments formed by these webs or division plates and forming, also, a through vertical passage between the side walls.

At the opposite side of the border member or frame are spaced inner and outer parallel .walls 101 and 102, across which are the two perforated transverse webs 103 and 104, forming therebetween a compartment for holding the receptacle or socket for a red or other lamp 105, shown in Figure 7. This lamp is used as a signal to indicate when the motor is in operation, and to prevent its being allowed to continue to operate indefinitely through carelessness of the operator.

Returning to Figure 8, it will be seen that the rectangular border frame provides communicating horizontal and vertical passages between the spaced side upper and lower portions thereof. A hollow boss 106 extends upwardly from the upper wall 89 of the lower portion of the border member and this is referably tapered to receive the socketed ower portion 107 of the hollow standard 108 which carries the electric motor 109 and fan 110. The motor is preferably resiliently supported in the upper portion of the hollow standard 108 and space is left at the rear of the upper portion of the standard for a chamber which communicates with the interior of the motor.

Referring to Figures 7 and 8, there are provided lateral flanges 112 and 113 projecting inwardly of the border frame and adapted to receive the fastenings for holding the grille 114, removably in place. Referring again to Figure 8, shoulders 115 and 116 are shown as provided upon the lower and upper portions of the border frame, the inturned lower and upper edges 117 and 118 of the grille 114 fitting against such shoulders. The grille plate may simply be mounted with a slip [it in the border frame or be held therein in any desired manner. In this instance the damper 119 is preferabl pivotally carried b y the upper portion o the border frame just rearwardly of the shoulder 116, as shown in Figure 6. The intermediate portion of the damper 119 is shaped to fit the peculiar shape given to the upper portion of the hollow post which supports the fan motor. The

5 fan 110, the fan being received within this outstanding portion which is provided not only with perforations in its outer portion,

but also in its rim-part.

Referring to Figure 6, a collar 121 having an angle' iron cross section is fitted between the wall 33 and the border member for closing the rear spaces in the upper, lower and side portions of the border member, the front spaces being enclosed by the front wall of the border member itself. As shown in Figure 7, the front lower portion of the border member is provided with the slots 122 to admit air into the chamber 91, which communicates as shown in Figure 6 with the hollow boss 106, by which air has free access to the chamber back of the motor 109 and to the motor 109. As shown in Figure 6, there is also a shoulder at the rear portion of the wall 89, to receive thereagainst the forward edge of the register box.

As shown in Figures 7 and 9, a switch box 124 is shown as being placed in the upper compartment between the webs 98 and 99 and an operating handle 125 for the switch is shown as on the exterior of theborder member. The compartment between the webs 96 and 97 is shown as occupied by a control box or resister 126, having its control button 127 also located exteriorly of the border member. In this Figure 9 also are shownfastenings 128 for securing the collar 121 to the wall of the building, which is not shown in this figure. Furthermore, screws 129 are shown in this Figure 9 for the purpose of securing the border member to the collar 121. These screws may be four in number, as indicated in Figure 7. The front wall 130 of the border member as shown in Figure 9 acts as a iiush plate or finishing plate for the outlet boxes in which the electrical devices 124 and 126 are mounted. These devices are accessible when the border members and collars are separated, as by unscrewing the fastenings 129.

Now, referring to Figure 10, the device is precisely as shown in Figure 9, except that the control buttons 125 and 127 are mounted within the plane of the front iiush plate 130 and there are additional walls 131 and 132 in the outlet boxes or electrical compartments for mounting the electrical devices and the control buttons 125 and 127.

Referring more particularly to Figures 11 and 12, a very similar form of device is here in shown in which the collar 121* is formed with a forward extension piece 133, for carrying the damper 119.

A further change consists in forming the hollow boss 106 with the collar 121n instead of with the border member. This entails the further modification that the shoulder 123a is on the collar, rather than the border member; also, that the shoulder member 117 is also in the collar and the front portion of the border member is provided with a flange 134 for fitting into this shoulder 117 and provided with the slip joint and with the grille, which in this instance is given a slightly dilferent form. Also, the form of the fan motor support is slightly altered, being more upright than is shown in Figure 6.

Now referring to Figures 13, 14 and 15, a fan 135 is shown in this instance as mounted for rotation in a substantially horizontal plane lying approximately at right angles to the open end or mouth of the register box, which is controlled b the damper 136, which is placed directly bellind the grille 137 and the grille forms the support in this case for the damper, which may be lifted out as a unit with the grille. In this case, the electric motor 138 is contained with a chamber 139. The chamber 139 has communication with the outside atmosphere through the openings or slots 141 near the floor line, while the upper portion of the 'chamber 139 is provided with perforations 142, just below the fan 135. The top wall of the chamber 139 is formed with the flange 143 to receive the inturned lower edge of the grille plate 137. In this instance, a collar 144 crosses the rear portion of the border frame and at the lower portion of the collar, as shown in Figure 14, is an inwardly bulged portion 145, having an upper angular portion 146, extending substantially in the same plane with the perforated top 142 and extending to the axial line of the fan 135, whereby to combine with the perforated top 142 to close the upper portion of the chamber 139. In this case, the damper 136 sweeps over the fan 135 and the fan circulates the air upwardly against the diagonally disposed baiiie when open, whereby to divert the currents of hot air through the grille 137 and into the room. In addition cold air currents are drawn in through the openings 141 and circulated upwardly by the fan, whereby when the damper 136 is open,

a local circulation in the room will constantly take place, being re-enforced with the proper mass of hot air in accordance with the port area exposed by the angular adjustment of the damper 136.

Referring more particularly to Figures 16, 17, 18 and 19, these figures are in all respects similar to Figure 3 and the same parts are given the same numbers, the difference in Figures 16, 17, 18 and 19 over` Figure 3 being one of direction of the supporting arms, rather than any diiierence in construction. In Figures 16 and 18, the arms extend diagonally rather than vertically and the line of separation between the arm and semi-circular sections is also diagonal rather than vertical. In Figure 16 the wall plug is indicated at 147 and is shown in proximity to the register fan. The diagonal arrangement of the arms as shown in Figure 16 enables the wires 148 to be carried into the lower arm at a nearer point than in the construction shown in Fi ures 1 to 4.

In igure 18, the lower fan supporting arm 149, which' in this case may be made solid round is shown as having the plate 150 secured as by the screws or other fastenin s 151 to the back of the grille plate. Also t e upper arm 152 is provided with the plate 153 l attached as by the screws or other fastenings 154 to a corner portion of the grille plate. This plate 153 as shown in Figure 19 forms the cover for an outlet box 155 carried upon the rear side of the grille plate 156. In this outlet box may be carried the lamp 1 57, the resister 158 with its external button control and the switch box 159 also with its external button control. Of course, the lamp 157 will be visible from the front of the device in order to show when the switch 159 is closed and the device operating.

Referring more particularly to Figures 20 and 21, a slightl modified form of outlet box is shown over Fyigure 19, in which the plate 153 carried by the arm 152, is aflixed to the rear wall 160 of the outlet box 161, which is formed separately from the grille plate and attached thereto as by the angle clips 162 and the fastenings 163. The grille forms the Hush plate of such box. The box is accessible by removing the box itself from the grille late.

p Referring now to Figures 22, 23 and 24, a grille 164 1s shown as mounted flush in a socket 165 in a frame member having the vertical and horizontal ianges 166 and 167. The motor and fan unit are supported as heretofore, with the hollow standard 168 communicating with a horizontally extending air box 169 bolted or otherwise secured to the grille, as indicated at 170. The front portion of the box 169 may be openin alignment with openings in the grille 164 to permit air from a low pomt in the room to be circulated to the electric motor.

This type of device is particularly advantageous to enable the grille and its supporting member to be separated, entirely from the motor unit. By simply removing the fastenings 170, the motor and motor fan and its supporting pedestal 169 may be detached and during the interval that the motor is bein repaired the supporting frame 166, 167 an the grille 164 may be replacedin the register box.

In Figure 27, a very similar arran ement is shown in which the grille1164 is rovided with one or more lower openings 171 to register with one or more similaropenings 172, made il; the front wall 173 of the air trunk or box 1 9*.

Referring more particularly to Figures 25 and 26, a-grille plate is shown at 1 74,as itting flush within a socket 175 made in a plate 176, which is fitted flush within the floor 177. In this case, the grille 174 carries the depend- 'ing flange 178 and within this iange is mounted the pivoted damper plates 179, havingthe operating arms 180 connected in common to the operating bar or member 181. A handle 182 connected with the bar 181 may project above the floor line for convenience in opening and closing the shutters 179. In this instance, the fan 183 lies below the shutters 179 and below the motor 184, which is carried by a similar support, the hollow arm 185 of which extends over to one edge of the grille plate and is exposed through the grille plate to the atmosphere at the floor line.

This device may be lifted as a unit from the supporting frame plate 176. The operation is the same as in prior cases. The middle shutters are provided with cut-out portions 186 and 187, in order to fit about the moto support.

Referring now to Figure 28, the fan is represented at 188 and the motor armature shaft at 189; the fan is provided with a hub 190 secured as by the set screw 191 to a cap 192 of insulating material, which extends about the end of the armature shaft 189. The insulating sleeve or cap 192 prevents the heat by conduction from gettin from the fan or hub to the shaft 189 and t ence back to the armature of the motor.

It will be obvious that changes in the construction, combination and arrangement of parts'could be made, which could be used without departing from the spirit of my invention, and I do not mean to limit the invention to such details, except as particularly pointed out in the claims.

Having thus described m invention, what I claim and desire to secure y Letters Patent of the United States is:

1. A register fan comprising in combination with a hot air stack and a register box, a grille plate removably secured to the register box, an adjustable damper for controllin the passage of hot air from the stack to the grille, said damper having a socket therein, and a motor fan unit occupying said socket.

2. The combination with a hot lair stack and a register box, of a ille removably secured to j the register ox, an adjustable damper back of the grille having a socket, a motor and fan unit, said motor occupying said socket, and a support for the motor car? ried by said grille.

3. The combination with a hot air stack and a register box, of a grille removably secured at the mouth of the register box, a damper hinged at its upper end to the upper portion of the grille and having a socket therein, a motor and fan unit, a support for the motor and fan unit affixed to said grille and extending into said-socket.

v4., In combination witha hotair stack and a register box, a frame extending over the opening of the register box and having a flanged opening therein, a grille plate having its edges tted removably in said flange opening of the border frame, a damper pivoted to the upper rear portion of the grille plate and a motor and fan unit carried by said grille plate between the grille plate and the damper.

5. In combination with a hot air stack and a register box, a border frame, a grille plate removably secured to the border frame, a damper adjustably secured to said grille plate, a motor fan unit also carried by said grille plate and having a support adapted to circulate cold air therethrough.

6. The combination with a hot air stack and a register box, of aborder :trame on the box, a 'grille plate removably secured to the border frame, a damper pivoted to the grille plate, hollow and split supporting members carried by said grille plate, and a motor and fan unit secured in said supporting members and receiving cooling air therethrough.

7. The combination with a hot air stack and a register box, of a border frame for the box, a grille plate removably secured in the border frame, a damper pivoted to the grille plate, split and hollow supporting members secured to the grille plate and an electric motor yieldably mounted in said supporting members andhaving openings therethrough, said members forming a hollow channel fon cooling air to said motor, and a fan carried by said motor.

` 8. In a heating system, a unitary structure consisting of a removable grille, an electric motor and fan located on the inner side of said grille and supported thereby, and a v damper also located on the inner side of said grille and supported thereby.

9. In a heating system, a unitary structure consisting of a removable grille, an electric mot-or and fan, and a damper, said motor and fan and damper being located on the inner side of said grille and carried thereby with the motor and fan located between the grille and damper. JAMES L. WATERBURY. 

